For the most part, twentieth-century politics was defined by economic issues. On the left, politics centered on workers, trade unions, social welfare programs, and redistributive policies. The right, by contrast, was primarily interested in reducing the size of government and promoting the private sector. Politics today, however, is defined less by economic or ideological concerns than by questions of identity. Now, in many democracies, the left focuses less on creating broad economic equality and more on promoting the interests of a wide variety of marginalized groups, such as ethnic minorities, immigrants and refugees, women, and lgbt people. The right, meanwhile, has redefined its core mission as the patriotic protection of traditional national identity, which is often explicitly connected to race, ethnicity,
or religion.

Again and again, groups have come to believe that their identities—whether national, religious, ethnic, sexual, gender, or otherwise—are not receiving adequate recognition. Identity politics is no longer a minor phenomenon, playing out only in the rarified confines of university campuses or providing a backdrop to low-stakes skirmishes in “culture wars” promoted by the mass media. Instead, identity politics has become a master concept that explains much of what is going on in global affairs.

Democratic societies are fracturing into segments based on ever-narrower identities,
threatening the possibility of deliberation and collective action by society as a whole. This is a road that leads only to state breakdown and, ultimately, failure. Unless such liberal democracies can work their way back to more universal understandings of human dignity,
they will doom themselves—and the world—to continuing conflict.

But in liberal democracies, equality under the law does not result in economic or social equality. Discrimination continues to exist against a wide variety of groups, and market economies produce large inequalities of outcome.

And the proportion of white working-class children growing up in single-parent families rose from 22 percent in 2000 to 36 percent in 2017.

Nationalists tell the disaffected that they have always been core members of a great
nation and that foreigners, immigrants, and elites have been conspiring to hold them down.